I just purchased your C172, great plane. There were four aircraft files, two that were marked the v10. I think the V10 are the ones you want me to use in X Plane 10 as both float and wheel versions look the same. I have a float version and a regular version with no wheel covers for 10. I don't have the version with the skids or the version with the wheel covers? I looked for skids wheel covers in objects folder, but couldn't see any.
The C172 has selectable options from its pop-up window (tab at lower left of screen labeled "O"). Here you can select wheel covers and fairings in the land version.